Sanding machine



Jan. 17, 1939. R {BLOOD 2,143,970

SANDING MACHINE Filed June 15, 1958 2 Sheets-Sheet l PERLEY T. BLOODJnnentog (Ittorneg Jan. 17, 1939. P. T. BLOOD 2,143,970

SANDING MACHINE Filed June 15, 1938 2 Sheets- Sheet 2 PER LEY T. aLdoo3nvcntor (Ittomeg Patented Jan. 17, 1939- Perley one-half to William A.

6 Claims. I

My present invention relates to an improved sanding machine of theportable, rotary disc type, and electrically operated for finishing,refinishing, and otherwise treating floors, floorsurfaces, and the like.The primary object of the invention is the provision of a portable,manually propelled and controlled electrically operated tool of thischaracter that is simple in construction and operation; composed of aminimum number of compactly arranged parts that are readily accessiblefor replacements and repairs; and because of the small space occupied bythe compactlyarranged machine or tool the latter may with facility workin corners and other if) restricted spaces that are ordinarilyinaccessible.

In, carrying out my invention I employ a powerrotor or unit, as thearmature and shaft of an electric motor, upon which the rotary disk ofthe machine is directly mounted, and means are provided whereby therotary power unit may be slightly depressed to vary the pressure of thedisk upon the floor, and in addition means are provided whereby acompound movement may be imparted to the rotary disk in order toadaptthe working face of the rotary disk to any irregu1arities in thesurface being treated.

The invention consists in certain; novel combinations and arrangementsof parts for accomplishing the above objects as will hereinafter be morefully set forth and claimed. In the accompanying drawings I haveillustrated one complete example of the physical embodiment of myinvention wherein the parts are combined and arranged in accord with thebest mode I have thus far devised for the practical application of theprinciples of my invention.

Figure l is a view in side elevation showing the sanding machine inposition for use.

Figure 2 is a. bottomplan view of the machine on a reduced scale.

Figure 3 is a vertical sectional detail view transversely through themachine.

Figure 4 is a detail top plan view of the bearinghead and part of thebrace-arm of the machine or Figure 5 is a bottom plan view of the fan orblower employed to convey dust from the machine to a dust-bag.

Figure 6 is an enlarged detail vertical sectional view showing part ofthe base or housing of the machine, and particularly the deformable,flexible, resilient, annular cushion or paid on which themotor ismounted, together with the resilient diaphragm at the bottom of themotor casing.

55 Figure 7 is a detail section of the joint between T. Blood, Hamilton,Mont, assignmof Bowcr,Hamilton, Mont.

Application June 15, 1938, Serial No. 213,812

the dust outlet-nipple and the dust bag of the machine.

The portable, manually controlled machine, preferablyelectricallyoperated, is of suitable size to be moved by hand over the surface orfloor tobe' treated, and it is supported upon a hollow base or housing Ihaving an inner bottom flange 2 formed with indicated in Figure 2 the acircular opening, andas bottom of the housing or base is of general ovalshape with a front plane face 3 and a rear plane face 4. These planefaces separate two series of venting grooves 5,

one series at each side. of the central opening in the bottom orbottom-flange of the machine. These grooves radiate from the centralopening to the outer periphery of the bottom, and they form plane faces5' of small area which, like the 2 larger faces 3 and 4 glide over thefloor surface,

or in a plane slightly The grooves assist elevatedabove the surface. inventilating the interior of the housing so that the dust is conveyed tothe outlet nipple 6 to which the dust bag I is joined. Thedust bag hasan opening, and a slide-fastening closure indicated ported and supportedat its attaching ring In that nipple 6. 7

The housing or secured thereto by screws also pass through holes in anattaching flange at 8, and the bagis supby a brace-rod 9, enclosedwithin the bag,

inner or lower end on the joins the bag with the hollow base has a topwall II It, and these screws l3 of the generally cylindrical motorcasing I4 mounted above the base.

Above the rigid top wall ll of the housing is mounted a flexible plateor resilient diaphragm forming the bottom l5, which, in addition to wallof the motor casing,

also provides a bearing support for the lower end of the rotor, andthecircular edge of this flexible plate is perforated to accommodate thescrews l2. Near the bottom of the motor casing are provided vent holesIE to provide for circulation of air within the casing and for removalof hot air currents, from the interior of the casing.

The edges of the resilient plate or diaphragm l5 are clamped beneath theflange B of the cas- 2 ing, and below this pl ate and flange is locatedan annular cushion I! of resilient material, as rubber suitable for thepurpose. This gasket, re-

silient ring-pad, or annular cushion is interposed between the plate 15plate H near the edg it possesses sufllcient and the face of the top eof the plate II, and while flexibility and resiliency to permit tiltingof the rotary disk so that a gyratory or parted to the rotary compoundmovement may be imdisk, the body of the ring or cushion-pad provides asubstantial support for the motor and other parts of the, machine.

The base portion of the casing is braced by the use of a handle I8secured at I9 thereto, and this handle has a horizontal or angular arm20 that extends diametrically across the top of the machine andterminates in a knob 2|, it being understood that the handle is graspedin one hand and the knob in the other hand for manipulating the machine.

The electric motor enclosed within the casing includes the stationaryfield 22, and the brushes 23 resiliently mounted in the ring 24 which issecured within the casing by screws 24' that are accessible from theexterior of the casing. The rotor of the motor includes the armature 25and commutator ring 25' fixed to rotate with the shaft 26, and thedust-fan or blower, located in the top of the housing is also fixed tothe shaft. This fan or blower includes a disk 2'! having blades 21a, andby means of the collar 21' the fan is keyed to the shaft so that it mayconvey dust from the interior of the housing to the outlet nipple 6. J

On the lower end of the armature shaft, which projects down through thepartitions or plates l5 and Ii and terminates at the bottom opening ofthe housing or base, is mounted the rotary disk 28 having an abrading,sanding, or rubbing surface or face 29 of usual character. The rotarydisk is threaded on the end of the armature shaft, to revolve therewith,and it may readily be unscrewed therefrom when required.

The lower bearing 30, for the armature shaft is mounted on the resilientbearing plate 05 just below the armature, which bearing is enclosed inthe cup 3i, as usual.

The armature shaft, armature, and rotary disk, are depressible with aslight resilient movement due to the pressure of the resilient bearingplate l5 and the resilient ring or pad l1, and in addition to the lowerbearing 30'3l, I employ a special upper bearing for the armature shaft,

' located above the commutator ring 25'.

This upper bearing includes a bearing ring 32 mounted or fixed on theshaft, and an enclosing, inverted bearing cup 33 that is non-rotatableand is provided with an upwardly extending sleeve 34 that projectsthrough an integral collar 35 at the top centerof the motor casing. Thesleeve and its enclosing collar are enclosed by the bearing head' orenlargement 36 that is fashioned integral with the brace arm 20, and anadjusting nut 31 is threaded on the projected end of the sleeve, toclamp the sleeve and collar inthe head. By loosening the nut the rotorand disk 28 may be adjusted verticallyi. within limits to vary theposition of the rotary disk with relation to the bottom of the housing,and then by tightening the nut the justed position. r

The upper end 38 of the shaft is squared to parts are held inadaccommodate a wrench, for use when the rotary disk 28 is being screwedon, or unscrewed from the shaft.

may be hollow, as indicated through the handle to suitable terminals,the

The electric wires, or cord 39, are connected to I the handle l8, whichat 39 in Fig. 1, and the wires may then pass.

current being under control of a conventional toggle-switch, as Mi.

Having thus fully described my invention what I claim as new and desireto secure by Letters Patent is:-

l. The combinationwith a housing forming a base, a resilientbearing-plate mounted on the base and a motor casing mounted on saidplate and base, of a motor within the casing including a rotor, a rotarydisk thereon, a lower bearing for the rotor mounted on said bearingplate, an upper bearing for the rotor mounted in the casing, and

means for adjusting said bearings.

2. The combination with a housing forming a base, an annular resilientcushion mounted on the housing, a circular resilient bearing platemounted on the cushion, and a motor casing mounted on the plate andcushion, of a motor within the casing including a rotor, a lower bearingfor the rotor mounted on said bearing plate,

an upper bearing for the rotor mounted in the casing, and means foradjusting said bearings and rotor.

3. The combination with a housing having a flanged open-center bottomand two lateral series of radiating grooves in the exterior face of thebottom, a motor including a rotor having a disk located in the opencenter of the bottom, a fan rotatable with the rotor, a dust-outletnipple opening from the housing, a dust receptacle mounted on thenipple. and means mounted on the nipple for supporting the receptacle.

4. In a sanding machine, the combination with a base and a motor casingresiliently mounted on the base, a motor within the casing and a f;

depressible rotor forming part of the 'motor, of a rotor shaft extendinginto the base and supporting a suction fan and a disk, of a resilientlymounted lower bearing for the rotor, an upper bearing for the rotorincluding a. member rotatable therewith, a stationary member of theupper bearing adjustable and mounted in the casing, and means forsecuring said adjustable member in fixed relation to the casing.

5. In a sanding machine, the combination with a base, a motor casing anda resilient diaphragm between these members, of a motor including avertically adjustable rotor having a bearing on said diaphragm, a secondbearing for the rotor including a rigid member, an adjustable exteriorlythreaded sleeve mounted in the casing tudinally adjustable rotor havinga disk located in the open center of the bottom, a suction fan rotatablewith the rotor, and resilient means forming a cushion between thehousing and the PERLEY 'r. BLOOD.

' motor.

